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David Hagege

@davidhagege

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Senior full‑stack engineer focused on simple, scalable solutions.

Japan

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What I'm looking for

I’m driven by purpose: I seek roles where my work improves lives. I thrive in remote-first, trust-based, async cultures with few meetings, clear ownership, and deep focus. While deeply comfortable with Ruby on Rails and GCP, I stay pragmatic and am excited to contribute wherever impact is greatest.

I am a KISS-driven senior software engineer with 18 years building front-end, back-end, DevOps, mobile and hardware solutions, focused on controlling complexity and delivering impactful products.

As CTO at an agritech startup, I led development of a mobile app and dashboard used by 40,000+ farmers, built a high-throughput satellite image pipeline, introduced Nix/NixOS, and consolidated repositories and infrastructure for greater efficiency.

I have led engineering teams, modernized platforms using Kubernetes, CI/CD, Terraform and cloud services, created open-source tools, and delivered cross-platform and embedded systems; I bring technical leadership, pragmatic engineering, and an entrepreneurial mindset.

Experience

Work history, roles, and key accomplishments

Current

AgTech CTO

Current

listenfield Inc.

Mar 2021 - Present (4 years 11 months)

Agritech: Integrated Predictive Agronomic Platform (~40 people start-up, multi-cultural ~12 nationalities). Building the Gitlab for Farmers, working with satellite images to estimate farmers fields' health, production, and when their crops will bloom

Ruby on Rails Ruby NixOS GCP PostgreSQL Gitlab Gitlab CI

Lead Engineer

Zeppelin

Jul 2020 - Dec 2020 (5 months)

Implemented CI/testing and rebuilt backend, migrating from Firestore to SQL on GCP and delivering a stable AR mobile shopping platform while mentoring engineers to improve code quality.

GCP Firestore SQL CI CD Backend Development Testing Mentoring

Technical Lead

Persol Career

May 2019 - Jun 2020 (1 year 1 month)

Modernized HR Tech systems, built React+Rails site with Elasticsearch, deployed Kubernetes with Terraform on GCP, implemented SSO and automated testing saving interview time and millions of yen in recruiter efficiency gains.

React Ruby on Rails Elasticsearch GCP Kubernetes Terraform SSO CI CD

Software Engineer

En-Japan

Dec 2014 - May 2019 (4 years 5 months)

Developed Scala and Ruby on Rails products including Vibe.work and ludo.team, built web crawlers and RPA solutions saving ~USD 1M annually and created an open-source tool to automate CloudFormation generation.

Scala Ruby on Rails AWS CloudFormation RPA Elasticsearch DevOps

Research Engineer

Orange Labs

Jun 2012 - Dec 2014 (2 years 6 months)

Developed Android apps with Scala frontends and Ruby backends, integrated Kinect-based consumer tracking and implemented mobile hot-desk and remote-control solutions for prototype deployments.

Android Scala Ruby Embedded Systems Kinect Mobile ROM Hacking Prototyping IoT

Founder

Myndpage

Feb 2011 - Feb 2012 (1 year)

Founded Myndpage, a social network connecting users by ideas/tags and secured angel investment from France and Dubai to develop the platform.

Product Development Fundraising Web Development Community Building

Software Engineer

LaCie

Jan 2008 - Apr 2010 (2 years 3 months)

Performed cross-platform C/C++ development for NAS/DAS products, created multi-user interfaces with biometric recognition and rewrote formatting tools including a capsule filesystem for device manuals.

C++Linux MacOS Windows NAS Filesystems

Software Engineer (Contract)

Novo Nordisk Laboratories

Jan 2008 - Mar 2008 (2 months)

Developed a cross-platform Python 2.4 application for child growth hormone prescription used by physicians, delivering clinical software on a short contract.

Python Cross Platform Development Clinical Software QA

System Admin Trainee

Oxalide

Jul 2007 - Jan 2008 (6 months)

Managed servers and developed client tools for a major web hosting provider, gaining operational and automation experience for large-scale hosting environments.

System Administration Linux server management Automation Client Tooling